I run the small CKSA12 compressor to operate my dual air lockers. As has been said, the downside to this unit is it can do nothing other than run your air locker(s). The upsides are many: it is ARB's lowest-cost compressor, it does its job beautifully, it is very compact, it draws very little current (6.5 amps at 30 psi), and it is fast. Any time I start my engine with the locker(s) already engaged--or whenever I first turn on the compressor--it will run for 5 or 6 seconds to get up to pressure. After that, during extended use it will kick on every so often, but for even shorter periods of time (only 2 or 3 seconds). It is really unobtrusive. If you're gonna run an air locker (or two), I cannot imagine operating them via any other setup.
I bought this compressor for the lockers because (a) I already had a MV-50 to inflate my tires, so (b) I knew I'd never try to use this for anything other than running my lockers, and (c) down the road I want to create some sort of York-based system, but I still wouldn't use that to run the lockers. I could not be happier with my air locker operation via this compressor.
Oh, since I mentioned current draw: ARB's largest compressor, the CKMTA12, can run lockers and inflate tires. However, it is rated to pull 50 amps under 30psi load (while delivering only 4.65 cfm in the process). Wire it correctly and that's not a problem, I know, but I felt it should be pointed out. Furthermore, this unit costs $340 more than my CKSA12. For that amount of extra money, I'd rather build a dedicated York system (complete with an air tank) which is more versatile and flows considerably more air as well. But maybe that's just me.
